Fireproof construction.



NO MODEL.

WIT/VB PATENTED MAY 5. 1 903. J. A. HOLMBOE.

FIREPROOP CONSTRUCTION.

ABPLIOATION FILED OUT. 27, 1902.

INVENTOR m: nonms versus no. PKOTD-LIKHJ, WASHINGTON n c UNTTTD STATES Patented May 5, 1903.

ATENT FFICE.

JENS A. HOLMBOE, OF LOUISVILLE, KENTUCKY.

SPECIFICATION forming part of Letters Patent No. 727,364, dated May 5, 1903.

Application filed October 27, 1902. Serial No. 129,015. (No model.)

To all whom it HMLZ/ concern:

Beit known that I, JENS A. HOLMBOE, a citizen of the United States, residing at Louisville, in the county of Jefferson, State of Kentucky, have invented certain new and useful Improvements in Fireproof Construction, of which the following is a specification, reference being had therein to the accompanying drawings.

This invention relates to a fireproof construction, and particularly to a floor or ceiling structure composed of concrete and metal.

The invention has for an objectto improve and strengthen the formation of a concrete and metal arch by the use of flat corrugated metal bars placed on edge and in parallel series, around which the concrete is disposed.

A further object of the invention is to dispose these bars at distances above the under face of the concrete, so as to provide a plaster key to insure abetter holding contact for the plaster face upon the under surface of the concrete.

Other and further objects and advantages of the invention will be hereinafter set forth and the novel features thereof'defined by the appended claims.

In the drawings, Figure 1 is avertical transverse section through the fireproof construction; Fig. 2, a plan of the supporting-bars; Fig. 3, a detail perspective of one of these bars, and Fig. 4: a longitudinal vertical section through the construction.

Like letters of reference refer to like parts in the several figures of the drawings.

The letter A designates a suitable support, which in the present instance is an I-beam, although if the masonry walls of the building are sufficiently close together the fireproof construction may be supported by a projection or corbel from the wall or by a recess to form a shelf therein, these several methods of support being well known in the art. Between these beams or supports a suitable mold or scaffold is formed and the flat corrugated bars B supported thereon at a slight distance above the main face of the mold, so that the main body of concrete may project below the under face of the bar, thus leaving a groove or key B beneath the bar B, adapted to receive the plaster face B applied to the under face of the'arch, and thus securely retain the same in position.

The bars 13 may be of any desired size, but are preferably of a width equal to from four to six times their thickness, while the corrugations thereof are of a depth between opposite projections approximately equal to the width or height of the bar, thereby preventing any longitudinal movement of the bar in the body of the concrete 0, which might permit a bending under strain and present a largely-increased contact-surface, which effectually prevents any lateral bending of the bar under similar conditions. These bars are placed at suitable distances apart corresponding to the load to be carried and stand on edge in parallel rows or series, as shown in Fig. 2. The bars may be rested upon either flange of the beam A or upon any other suitable support, but are herein shown as provided with a body of concrete 0 beneath the ends of the bars, which permits the formation of an attractive panel upon the under face of the arch and reduces the amount of concrete necessary in the formation thereof. It will also be noted that the corrugated formation of the bar obviates the necessity of fastening the ends thereof, as the bars may be rested upon their edge and the spaces between the same filled with concrete without the use of any retaining or supporting devices. If the concrete is tamped, however, it is sometimes desirable to brace the bars against lateral movement when the concrete is forced-between the same, and this may be accomplished by means of a transverse hook- D, bent at a right angle to the body of the bar and adapted to embrace the upper face of the supporting-bars B, as shown in Fig. 4;.

The term concrete as herein used refers to the plastic material commercially known as such; but it is obvious that any other material having equivalent characteristics might be used to form the slab or arch about these bars, and the bars maybe either straight or curved upward to form a curved or arched support, which latter, as shown in Fig. 1,. greatly increases its carrying capacity, and the longitudinal bend in the bar will be equal to the camber or rise in the slab, making it concentric with the soffit or under face thereof. The bars being in the bottom or tension flange of the slab when the concrete has hardened provide a high tensile strength which is not present in the concrete alone and enable the formation of large concrete spans. By the use of the corrugated bars having no straight longitudinally-extending face it will be seen that a much increased adhesion surface is secured and any longitudinal bending of the bar prevented, thus makinga most desirable binder within the concrete. It will furthermore be seen that these bars may be formed very cheaply, it being only necessary to pass the same between corrugated rolls.

It will be obvious that changes may be made in the details of construction and configuration and of the relation of the bars to their supports without departing from the spirit of the invention as defined by the appended claims.

Having described my invention and set forth its merits, what I claim, and desire to secure by Letters Patent, is

1. In a fireproof construction, opposite supports, a body of plastic material extending between the same, and flat corrugated bars disposed on edge through the material between the supports and disposed above the under surface of the material to form a groove or key; substantially as specified.

2. In a fireproof construction, opposite supports, a body of plastic material extending between the same, fiat corrugated bars disposed on edge through the material between the supports and disposed above the under surface of the material to form a groove or key, and a body of concrete between the opposite ends of the bars and the support therefor; substantially as specified.

3. In a fireproof construction, opposite supports, a body of plastic material extending between the same, flat corrugated bars disposed on edge through the material between the supports and disposed above the under surface of the material to form a groove or key, a body of concrete between the opposite ends of the bars and the support therefor, and a hook-bar extending between the corrugated bars and adapted to engage the same; substantially as specified.

at. In a fireproof construction, opposite supports, a series of parallel corrugated fiat bars disposed on edge between the supports, a

body of plastic material surrounding said bars and extending below the same to form grooves or keys beneath the bars, and a plaster face adapted to enter said grooves or keys; substantially as specified.

5. In a fireproof construction, opposite supports, a body of plastic material extending between the same, and a corrugated fiat bar disposed on edge between the supports and bent vertically between its ends to form an arch; substantially as specified.

In testimony whereof I affix my signature in presence of two witnesses.

JENS A. HOLM EOE.

Witnesses:

R. C. STEPHENS, S. G. TYLER. 

